[FLINK-37084][python] Fix TimerRegistration concurrency issue in PyFl… #1511

Job	Run time
Pre-compile Checks / Basic QA	12m 1s
Default (Java 17) / Compile	9m 8s
Default (Java 17) / E2E (group 1)	1h 29m 12s
Default (Java 17) / Test packaging/licensing	35m 7s
Default (Java 17) / E2E (group 2)	1h 48m 49s
Default (Java 17) / Test (module: core)	21m 36s
Default (Java 17) / Test (module: python)	34m 39s
Default (Java 17) / Test (module: table)	33m 11s
Default (Java 17) / Test (module: connect)	21m 5s
Default (Java 17) / Test (module: tests)	36m 39s
Default (Java 17) / Test (module: misc)	26m 29s
	7h 7m 56s

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